package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import io.swagger.models.auth.In;
import lombok.extern.slf4j.Slf4j;
import net.sf.jsqlparser.expression.DateTimeLiteralExpression;
import org.apache.commons.lang3.StringUtils;
import org.apache.ibatis.annotations.Select;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * @Description: 数据统计相关业务实现类
 * @BelongsProject: sky-take-out
 * @BelongsPackage: com.sky.service.impl
 * @Author: zhouzhijie
 * @CreateTime: 2023-11-28  16:06
 * @Version: 1.0
 */
@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    /**
     * @description: 统计指定时间区间内的营业额数据
     * @author: zhouzhijie
     * @date: 2023/11/28 16:07
     * @param: [begin, end]
     * @return:
     **/
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放begin到end的每一天日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            //日期计算，计算指定日期后一天对应的日期
            begin =begin.plusDays(+1);
            dateList.add(begin);
        }
        //存放每天的营业额
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate localDate : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(localDate, LocalTime.MIN);//当天的开始时间
            LocalDateTime endTime = LocalDateTime.of(localDate, LocalTime.MAX);//当天的结束时间

            //查询date日期对应的营业额数据。营业额是指：订单状态为“已完成”的订单金额总计
            Map map = new HashMap<>();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }

        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList,","))
                .build();
    }

    /**
     * @description: 统计指定时间区间内的用户数据
     * @author: zhouzhijie
     * @date: 2023/11/28 19:36
     * @param: [begin, end]
     * @return: 
     **/
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放begin到end的每一天日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            //日期计算，计算指定日期后一天对应的日期
            begin =begin.plusDays(+1);
            dateList.add(begin);
        }

        //存放新增的用户数量 select count(id) from user where create_time < ? and create_time > ?
        List<Integer> newUserList = new ArrayList<>();
        //存放的总用户量  select count(id) from user where create_time < ?
        List<Integer> totalUserList =new ArrayList<>();
        //遍历dateList，查询每天的新增用户输和总用户数
        for (LocalDate localDate : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(localDate, LocalTime.MIN);//当天的开始时间
            LocalDateTime endTime = LocalDateTime.of(localDate, LocalTime.MAX);//当天的结束时间
            Map map = new HashMap<>();
            map.put("end",endTime);
            //总用户数量
            Integer totalUser = userMapper.countByMap(map);
            map.put("begin",beginTime);
            //新增用户数量
            Integer newUser = userMapper.countByMap(map);
            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }
        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .build();
    }

    /**
     * @description: 统计指定时间区间内的用户数据
     * @author: zhouzhijie
     * @date: 2023/11/28 20:59
     * @param: [begin, end]
     * @return:
     **/
    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放begin到end的每一天日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            //日期计算，计算指定日期后一天对应的日期
            begin =begin.plusDays(+1);
            dateList.add(begin);
        }

        //存放每天订单总数
        List<Integer> orderCountList = new ArrayList<>();
        //存放每天有效订单数
        List<Integer> vaildOrderCountList = new ArrayList<>();
        //遍历dateList，查询每天的有效订单数和订单总数
        for (LocalDate localDate : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(localDate, LocalTime.MIN);//当天的开始时间
            LocalDateTime endTime = LocalDateTime.of(localDate, LocalTime.MAX);//当天的结束时间
            //查询每天的订单总数
            Integer orderCount = getOrderCount(beginTime, endTime, null);
            //查询每天的有效订单数
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);
            orderCountList.add(orderCount);
            vaildOrderCountList.add(validOrderCount);
        }
        
        //计算时间区间的订单数总和
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();

        //计算时间区间的有效订单数总和
        Integer validOrderCount = vaildOrderCountList.stream().reduce(Integer::sum).get();

        Double orderCompletionRate = 0.0;
        if (totalOrderCount != 0){
            //计算订单完成率
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }

        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(vaildOrderCountList, ","))
                .validOrderCount(validOrderCount)
                .totalOrderCount(totalOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * @description: 根据条件统计订单数量
     * @author: zhouzhijie
     * @date: 2023/11/28 21:30
     * @param: [begin, end, status]
     * @return:
     **/
    private Integer getOrderCount(LocalDateTime begin,LocalDateTime end,Integer status){
        Map map = new HashMap<>();
        map.put("begin",begin);
        map.put("end",end);
        map.put("status",status);
        Integer count = orderMapper.countByMap(map);
        return count;
    }

    /**
     * @description: 统计指定时间区间内的查询销量排名top10
     * @author: zhouzhijie
     * @date: 2023/11/29 9:46
     * @param: [begin, end]
     * @return:
     **/
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        //统计指定时间区间内的查询销量排名top10
        List<GoodsSalesDTO> goodsSalesDTOList =  orderMapper.getSalesTop10(beginTime,endTime);

        //将集合的各属性的单独装成一个List
        List<String> names = goodsSalesDTOList.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        List<Integer> numbers = goodsSalesDTOList.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());

        String nameList = StringUtils.join(names, ",");
        String numberList = StringUtils.join(numbers, ",");

        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    /**
     * @description: 导出运营数据报表
     * @author: zhouzhijie
     * @date: 2023/11/29 15:21
     * @param: [response]
     * @return: 
     **/
    @Override
    public void exportBusinessdata(HttpServletResponse response) {
        //1、查询数据库，获取营业数据------查询最近30天营业数据
        LocalDate beginDate = LocalDate.now().minusDays(30);//当天的前30天
        LocalDate endDate = LocalDate.now().minusDays(1);//当天的前一天

        LocalDateTime beginTime = LocalDateTime.of(beginDate, LocalTime.MIN);//前30天的开始时间
        LocalDateTime endTime = LocalDateTime.of(endDate, LocalTime.MAX);//前一天的结束时间

        //查询概览数据
        BusinessDataVO businessData = workspaceService.getBusinessData(beginTime, endTime);

        //2、通过POI将数据写入Excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        try {
            //基于模板文件从创建一个新的Excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);

            //获取报表文件的Sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");

            //填充数据
            // 获得第一行时间
            String time = "时间：" + beginDate + "至" + endDate;
            sheet.getRow(1).getCell(1).setCellValue(time);

            //获得第四行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessData.getTurnover());
            row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessData.getNewUsers());

            //获得第五行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessData.getValidOrderCount());
            row.getCell(4).setCellValue(businessData.getUnitPrice());

            //填充明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = beginDate.plusDays(i);//每一天的日期

                //查询每一天的营业数据
                beginTime = LocalDateTime.of(date, LocalTime.MIN);
                endTime = LocalDateTime.of(date, LocalTime.MAX);
                businessData = workspaceService.getBusinessData(beginTime, endTime);

                //获得某一行-----从第八行开始
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            //3、通过输出流将Excel文件下载到客户端浏览器中
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭资源
            out.close();
            excel.close();

        } catch (IOException e) {
            throw new RuntimeException(e);
        }

    }
}
